You can view reports once the items have been returned. Even then, you don’t get to see customer comments. You only see those if Amazon flags a product for a high percentage of returns (which this may do). In that email, you’ll see customer comments.

I would bet he is replacing your good product with something else and returning as inad. Free return shipping and he get your product for free. That many bought and returned should be a huge flag that something is up.

I really hope it’s not malicious. Selling on Amazons platform is walking on eggshells compared to all others. He still can return those other 20…. He could keep the other 20 to show not all your items are bad but return other 20 with issues, still hurting greatly. It doesn’t take much to get suspended.We know that’s not the case of bad product of yours.